Stop mechanism for presses



Aug. 18 1931. I w. CAl/IERON 1,819,673

S TOP MECHANISM FOR PRESSES Filed Sept. 15. 1928 4 Sheets-Sheet l Aug.18, 1931.

w. CAMERON STOP MECHANISM FOR PRESSES Filed Sept. 15. 1928 4Sheets-Sheet 2 pfzwerzarx Aug. 18, 19 31 I w; CAMERON v 1,819,673

STQP MECHANISM FOR PRES SES Filed Sept} 15'. 1928 4 Sheets-Sheet s 1931-w. CAMERON 1,819,673

STOP MEcHmIsM FOR PRESSES Filed s e t. 15. 1928 4 Sheets-Sheet 4 I wr iso Fig. 5.

armed Aug. 18,- 1931 PA-TENT OFFICE I WILLIAM'CAMERON, OF CHICAGO,ILLINOIS, ASSIGNOR TO CAMERON CAN MACHINERY COMPANY, OF CHICAGO,ILLINOIS, A CORPORATION OFILLINOIS STOP MECHANISM FOB PRESSESApplication filed September 15, 1928. Serial No. 306,255.

30 being fed. These mechanisms operate with varying degrees of accuracyand reliability and are usually disposedin proximityto the feedway andspaced from the dies. Should these mechanisms fail, there would benothing to prevent an excessively thick or more than one blank beingdelivered between the dies. The primary object ofthis invention isaccordingly to provide a mechanism for automatically stopping thepresswhen an excessively thick or more than one blank is fed between thedies. This mechanism may be i used without the above mentioned automaticstop mechanisms or it may be used in conjunction therewith as an addedsafety devlce or auxiliary mechanism.

Other and further objects of this invention will become apparent as thesame becomes better understood from an examination of the specificationand claims in connection with the accompanying drawings wherein Fig. 1is a side elevation partly in section and with the parts cut away of anautomatic die press of the type illustrated and described in connectionwith my prior Patent #1,47 7,- 240 of December 11, 1923.

Fig. 2 is a fragmentary view of the press taken at the line 9-2 ofFigure 1 illustrating the parts in normal running position.

Fig. 3 is a similar fragmentary view illustratingthe parts in positionupon the occur-.

. ce of a blank of abnormal thickness.

' Fig. 4' is an enlarged detailed view showing part of the mechanismremoved.

another part of the mechanism.

Fig. 6 is an elevation of the part shown in Fig. 5.

Fig. 7 is a section taken at the line 7- -7 of Fig. 5 is an enlargeddetailed plan view of Fig. 8 is a section taken at the line 8-8 of Fig.5.

Referring to the drawings more particularly, the reference character 9represents a frame provided near its top with suitable bearings 11 inwhich the main power shaft 12 of the die press is j ournaled. The shaft12 is suitably driven and provided with a fly wheel or a belt pulley 13,and a central crank 14 between the spaced bearings 11, by means of whicha cross head 15 is reciprocated in the guideway 16 of the machine frameto reciprocate the upper die 17 to co-operate with the stationary lowerdie 18 mounted on the bed of the machine. The blanks of tin or othermaterial to be operated upon are adapted to be disposed in a pile in themagazine (not shown) from which they areto be lifted in succession by aseries of suction cups (not shown) into alignment with the feed channel,whereupon they are moved laterally edgewise into this channel by asuitable transfer-ring device. The blanks arethen fed along the channelto the dies 17 and 18 one at a time by a feed slide 19,.which isprovided with a series of dogs 21. The operation of the aforementionedparts will be clearly understood from an examination of my aforesaidprior Patent #1,477,240, and my prior Patent #1,277,342, of August 27,1918.

Should more than one or an excessivelythe operation of the automaticstop mechanism hereinafter described.

A laterally projecting lug 22 is provided on the wheel 13 near its outerperiphery. This lug is given a lateral movement upon the temporarydistortion of the shaft 12 by the abnormal blank or number of blanksbetween the dies, and this movement is appreciable by reason of thespaced position of the wheel 13 from the crank 14, and also by reason ofsaid lug being positioned so far out on "the radius of said wheel.

Normally this lug 22 is carried by the wheel 13 out of contact with themechanismadapted to be actuated by said lug, to cause the stopping ofthe press, but when this lug is given the lateral movement justdescribed, it engages said mechanism which will presently be described.

A hand lever 23 is fixedly mounted on a shaft 24 and has an extension 25pivotally connected with a link 26. This link is adjustably connected toa rod 27, which in turn is connected to a clutch shoe 28 for stoppingthe press. These parts 23 to 28, inclusive, wherey the handle may stopor start the press are substantially the same 'as shown in my priorPatent #1,47 7 ,240, above mentioned.

A laterally extending arm 29 is pivotally mounted on a pin 31 carried bya bracket 32, which is bolted to the frame at the side of the guideway16. This arm 29 is pr ovided with a renewable projection 33, at itsouter end, adapted to be engaged by the lug 22 as the same is rotatedand given its lateral movement previously described. When the lug 22engages the projection 33, the arm 29 will be actuated downwardly. Thearm 29 is apertured to receive the upper end of a rod 34 and isadjustably connected therewith by means of nuts 35.

The lower end of the rod 34 is 'pivotally connected to a lever 36. Thelever 36 is pivotally mounted on a pivot 37 in the form of a boltattached to the frame of the machine in proximity to a guideway 38 alsoattached to said frame. The outer end of the lever 36 is provided with ahandle 39, whereby the lever may be manually actuated as well asautomatically by the rod 34 when the arm 29 is actuated by the lug 22.as previously described. The inner end of the lever 36 isin the form ofa projection or stop 41, which normally extends into the guideway 38 inengagement with a shoulder 42 on a slide 43 in said guideway. A spring44 normally holds the lever 36 in position to cause the stop 41 toengage the shoulder 42 and is adapted to yield under action of the rod34 and arm 29 when the same is actuated. v

A link 45 is pivotally connected at one end to the slide 43 and at itsother end to the extension 25 whereby action of the slide. in onedirection may. cause parts 23 to 28, inclusive,

previously described to be actuated for stopping the press. A spring 46secured at one end to the link 45 and at the other end to the.

frame tends to move the slide to cause it to actuate the said mechanismcomprising parts 23 to 28, inclusive, for stopping the press, but solong as the stop 41 is in engagement with the shoulder 42, this isprevented.

' operation upon the occurrence of a blank of abnormal thickness 'themovable 05 die will notbe able to make the full normal movement and willaccordingly springshaft '12. The springing of shaft 12 will cause adeflection of the fly wheel or belt pulley 13 which will in turn causelug 22 to strike arm 29. Movement of arm 29 will actuate lever 36 towithdraw stop 41 from shoulder 42 whereupon spring 46 will automaticallymove slide 43 to throw the clutch shoe 28 and stop the press.

In order to provide for a fine regulation and adjustment of the spacingof the projection 33 on the arm 29 from the lug 22, I

the pivot pin 31 (Fig. 4) on which the arm 29 is mounted iscccentrically formed between its bearings. Angular adjustment of the pinwill therefore regulate the spacing of the member 33 from the wheel 13,and incidentally the lug 22 carried thereby. Adjustment of the pin maybe accomplished by a wrench or tool shaped to fit the squared head ofsaid pin which is locked in the desired position by clamping bolts 47adapted to compress the split bearings within which the pin is mounted.

The advantages and operation of the aforedescribed mechanism will beapparent without further description.

I am aware that many changes may be made without departing from theprinciples of this invention. I, therefore, do not wish to be limited tothe details shown or described.

I claim:

1. In a die press, the combination of a rigid frame, a stationary dieseated therein and a movable die reciprocable in said frame toward andfrom said stationary die, with means for stopping said press operable inaccordance with the difference in movement of said movable die withrespect to said frame and stationary die resulting from excessiveresistance to the movement thereafter le die mounted therein and a driveshaft journalled in said frame for actuating said reciprocable die, withmeans operable by the springing of said shaft for stopping the presswhen material of unusual thickness has been delivered between said diemembers.

3. In a die press, the combination of a ri 'd frame, a stationary dieand a reciproca le die mounted therein, a drive shaft for operating saidreciprocabl'e die and a wheel on said shaft, with means actuated by saidwheel for stopping thepress when the. die members encounter material ofabnormal thickness.

4. In a die press, the combination of a rigid frame, a stationary dieand a recipro- 1e die mounted therein, a drive shaft for operating saidreciprocable die and a wheel on said shaft, with means for stopping theress actuated by the deflection of said wheel om its normal plane ofrotationcau'sed by the die members encountering material of abnormalthickness.

5. In a die press, the combination of a rigid frame, a stationary dieand a reciprocable die mounted therein, a drive shaft for operating saidreciprocable die and a wheel on said shaft, with means for stopping thepress actuated by the deflection of said wheel from its normal plane ofrotation caused by the die members encountering material of abnormalthickness, said means compris ing a' trip mechanism operable todisengage the drive shaft from the. source of power.

6. In a die press, the combination of a rigid frame, a stationary dieand areciprotion thereby, and means rendered operable cable die mountedtherein, a drive shaft for operating said reciprocable die withreleasable mechanism carried by said shaft for stopping said pressrendered operable by the spnngingof said shaft when the die mem bersencounter excessive resistance to their relative movements.

7. The combination of ary die and a rotatable shaft carried there by, areciprocable die connected to said shaft for actuation thereby, andmeans rendered operable by deflection-of said shaft induced by excessiveresistance to movement of said reciprocable die for causing cessation ofrotation of said shaft.

8. The combination of a frame, a stationary die and a rotatable shaftcarried by said frame, a wheel on said shaft, a reciprocable dieconnected to. said shaft for actuaby deflection of said wheel from itsnormal plane of rotation induced through said shaft by excessive tomovement of said reciprocable die for causing cessation of rotation ofsaid shaft.

the foregoing aifix my WILLIAM CAMERON.

' -In witness of signature.

a frame, a station-

